EXFO FTB-700 for FTB-1 - Manual (Page 278)

Maintenance
270 FTB-700 Series
Verifying Your OTDR
To verify the OTDR’s zero:
1. Connect a patchcord, approximately 10 m long, to the OTDR port. The
exact length of the jumper must have been measured mechanically.
Ideally, you should use an unjacketed patchcord.

Ensure that the OTDR port and connectors are correctly cleaned.

Ensure that the fiber settings are accurate (IOR, Helix factor
and RBS).
2. Set the distance range to less than 2 km, the pulse width to 10 ns and
the acquisition time to 30 s.
3. Take a distance measurement, positioning marker A as shown below.
Note: You can also press the Analyze button from the Event pane. The analysis
should return the right position directly.
The position of the marker should be equal to the length of the jumper
(± 2 m). For example, 8 to 12 m if the jumper is 10 m long.
If the distance error is beyond this limit, return the OTDR to EXFO.